Soft-start circuit and buck converter comprising the same
AssigneeSemiconductor Components Industries, LLC
InventorsSangCheol MOON, Gwanbon KOO, Chenghao JIN, Bonggeun CHUNG
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Abstract
A buck converter includes a power switch having a first end to receive an input voltage, and a soft start circuit configured to compensate a soft start voltage during a soft start time period according to a result of comparing a feedback voltage corresponding to an output voltage of the buck converter and an input detection voltage corresponding to the input voltage. The buck converter controls switching of the power switch using the soft start voltage.
Claims20
A method of controlling a power switch in a converter circuit, the method comprising:
- during a soft start time period:
- comparing a feedback voltage corresponding to an output voltage of an output terminal of the converter circuit to an input detection voltage corresponding to an input voltage of an input terminal of the converter circuit,
- causing the soft start voltage to increase at a first slope in response to the feedback voltage being lower than the input detection voltage,
- causing the soft start voltage to change according to a second slope different from the first slope in response to the feedback voltage being higher than the input detection voltage, and
- controlling switching of the power switch using the soft start voltage and the feedback voltage,
- wherein the power switch is coupled to an inductor between the input terminal of the converter circuit and the output terminal of the converter circuit,
- wherein the input voltage is an Alternating Current (AC) voltage, and
- wherein the input detection voltage is a rectified AC voltage.
A method of controlling a buck converter, the method comprising:
- during a soft start time period:
- comparing a feedback voltage corresponding to an output voltage of the buck converter and an input detection voltage corresponding to an input voltage,
- causing the soft start voltage to increase at a first slope in response to the feedback voltage being lower than the input detection voltage,
- causing the soft start voltage to change at a second slope different from the first slope in response to the feedback voltage being higher than the input detection voltage, and
- controlling switching of a power switch using the soft start voltage,
- wherein the power switch has a first end that receives the input voltage,
- wherein the input voltage is an Alternating Current (AC) voltage, and
- wherein the input detection voltage is a rectified AC voltage.
Dependencies are inferred from the claim text.